Even if there's no actual guest rappers on Detox, there would still technically be guest appearances cuz we all know Dre doesn't write his own stuff....
....If it were up to me, i would feature basically all the people who have been involved in his career...kurupt, nate dogg, warren g, snoop, maybe daz, d.o.c., lady of rage, mc ren, ice cube, rbx, the game, 50 cent (maybe g-unit too), eminem, mary j. blige, etc....if he had old aftermath artists on there too, like hitman, rakim, etc, that would be dope...maybe get Pac on there but thatd be doubtful...i think thats what detox should be, like a summary of dre's career from the beginning leading up to now and what's to come...hence the title detox, he's done w/ rapping, but before he can officially put the mic down, he's gotta collab w/ everyone that's been a part of the ride, so he can quit...that's how he should go out in my opinion...